Electrical Measurements

Voltage

Use the measure command to test voltages on these PLT signals:

measure voltage channels

channel

PLT Signal

Method

Max Voltage

voltageDATP00

DATP00

ADC

5.5V

voltageDATP01

DATP01

ADC

5.5V

voltageDATP02

DATP02

ADC

5.5V

voltageDATP03

DATP03

ADC

5.5V

voltageDATP04

DATP04

ADC

5.5V

voltageDATP05

DATP05

ADC

5.5V

voltageDATP06

DATP06

ADC

5.5V

voltageDATP07

DATP07

ADC

5.5V

voltageDATP08

DATP08

ADC

5.5V

voltageDATP09

DATP09

ADC

5.5V

voltageDATP10

DATP10

ADC

5.5V

voltageDATP11

DATP11

ADC

5.5V

voltageDATP12

DATP12

ADC

5.5V

voltageDMM

DATPxx/DDTPxx

DMM

100V

voltageMUX0

MUX0

ADC

5.5V

voltageMUX1

MUX1

ADC

5.5V

voltageMUX2

MUX2

ADC

5.5V

voltageMUX3

MUX3

ADC

5.5V

Caution

In order to avoid damage to the PLT, take care that signals are below the Max Voltage for the selected measurement channel.

Example PLT test plan: Measure Voltages
title: Measure Voltages
suite:
- title: Measure DATPxx Voltages
  steps:
  # On the PLT-300A, it's necessary to connect DATP00 ... DATP06 to the mux before using voltageDATP00 ... voltageDATP06
  - command: mux connect DATP05
  - command: mux connect DATP06
  - command: measure voltageDATP05 3.1-3.4V
  - command: measure voltageDATP06 0.5-1.2V
  - command: measure voltageDATP07 200-3500mV
  - command: measure voltageDATP08 -0.2-0.1V
  - command: measure voltageDATP09 0-4V
  - command: measure voltageDATP10 -0.1-3.3V
  - command: measure voltageDATP11 0-3.4V
  - command: measure voltageDATP12 -0.1-3.4V
- title: Measure MUXx Voltages
  steps:
  - command: mux 0 DATP00
  - command: mux 1 DATP01
  - command: mux 2 RATP00
  - command: mux 3 RATP17
  - command: measure voltageMUX0 >1V
  - command: measure voltageMUX1 <3300mV
  - command: measure voltageMUX2 >100mV
  - command: measure voltageMUX3 1500-1800mV

Example: Use DMM to measure voltages >5V.

title: "Measure High Voltages"
suite:
- title: Measure
  steps:
  # Check 24V rail, relative to GND4.
  - command: measure voltageDMM DATP00 22.8-25.2V
    ground: GND4
  # Check 12V rail, relative to PLT system GND.
  - command: measure voltageDMM DATP01 11-13V

Commands

Voltage (differential)

To measure differential voltage, use the measure command with the voltageDiff channel and 2 signal names.

measure voltageDigg signals

channel

Method

Max Voltage

DATP00

ADC

5.5V

DATP01

ADC

5.5V

DATP02

ADC

5.5V

DATP03

ADC

5.5V

DATP04

ADC

5.5V

DATP05

ADC

5.5V

DATP06

ADC

5.5V

DATP07

ADC

5.5V

DATP08

ADC

5.5V

DATP09

ADC

5.5V

DATP10

ADC

5.5V

DATP11

ADC

5.5V

DATP12

ADC

5.5V

Example: Measure differential voltage between DATP00 and DATP01

title: "Measure differential (ADC)"
suite:
- title: Measure
  steps:
  - command: measure voltageDiff DATP00-DATP01 >100mV

The voltageDMM can also be used to perform differential measurements, by specifying a custom ground:.

ground

Description

Max Voltage

GND

PLT System ground (default)

5.5V

GND1

DUT Ground #1

100V

GND2

DUT Ground #2

100V

GND3

DUT Ground #3

100V

GND4

DUT Ground #4

100V

1V8OUT

1.8V supply

1.8V

3V3OUT

3.3V supply

3.3V

5VOUT

5V supply

5.0V

VARVOUT

VARV supply

24.5V

RVREF

RVREF mux signal

5.5V

Example: Use DMM to measure differential voltage.

title: "Measure differential (DMM)"
suite:
- title: Measure
  steps:
  # Connect DATP00 to RVREF over MUX
  - command: mux 0 DATP01
  - command: mux 3 RVREF
  - command: short 0 3 set
  - command: mux connect DATP00
  # Measure DATP00 rail, relative to RVREF
  - command: measure voltageDMM DATP00 >100mV
    ground: RVREF

Commands

Current Draw

Use the measure command with current draw on these power rails:

measure current channels

channel

Power Rail

Method

current1V8

1V8

ADC

current3V3

3V3

ADC

current5V

5V

ADC

currentVARV

VARV

ADC

currentDMM

1V8, 3V3, 5V, VARV, 12V, or 24V

DMM
Example PLT test plan: Measure Current Draw
title: Measure Current Draw
suite:
- title: Measure Currents
  steps:
  - command: measure current3V3 <1A
  - command: measure current5V 0.1-0.5A
  - command: measure currentVARV >100mA
  - command: measure currentDMM 1V8 <100mA
  - command: measure currentDMM 5V 0.1-0.5A

Note

The currentDMM measurement channel is only available on the PLT-300A.

Commands

Resistance

To measure resistance, use the measure command with the resistance or impedance channel.

The resistance channel measures resistance between the specified signal and the current system ground or a specified ground.

The impedance channel measures between the RA an RVREF PLT signals, which must be connected to the signals of interest, before performing the measurement.

We recommend using the resistance channel, unless compatibility with the PLT-200A is required.

Example test plan: Measure Resistance
title: Measure Resistance
suite:
- title: Measure Resistance
  steps:
  # Measure resistance between DATP01 and system ground, with 5V reference
  - command: measure resistance DATP01 45-48kOhm 5V
  # Measure resistance between GND3 and DATP01
  - command: measure resistance DATP04 <50kOhm
    ground: GND3
  # Measure resistance between DATP02 and system ground, auto-ranging disabled.
  - command: measure resistance DATP02 9-11kOhm
    with:
      - disableAutoRange
Example test plan: Measure Resistance
title: Measure Resistance
suite:
- title: Measure Resistance
  steps:
  - command: mux 0 RATP02
  - command: mux 1 RATP18
  - command: mux 2 RA
  - command: mux 3 RVREF
  - command: short 0 2 set
  - command: short 1 3 set
  - command: measure impedance 750-1000mOhm 3.3V
  - command: short 0 2 release
  - command: short 1 3 release
  - command: sleepms 1500
  - command: measure impedance 2-10Ohm 3300

Commands

Capacitance

To measure capacitance, use the measure command with the capacitance channel.

The capacitance measurement will be performed between the specified signal and ground. If no ground is specified, the system ground will be used.

Note

Capacitance measurement is only available on the PLT-300A.

Example PLT test plan: Measure Capacitance
title: Measure Capacitance
suite:
- title: Measure Capacitance
  steps:
  - command: ground 1
  - command: measure capacitance DATP01 <15nF
  - command: measure capacitance DDTP05 <150nF
  - command: measure capacitance DATP02 0.5-1.5uF
    ground: GND3

Commands

Continuity

To measure continuity, use the measure command with the continuity channel.

Continuity is measured between the specified signal and ground. If no ground is specified, the system ground will be used.

Note

Continuity measurement is only available on the PLT-300A.

Example PLT test plan: Measure Continuity to Ground
title: Measure Continuity to Ground
suite:
- title: Measure Continuity to Ground
  steps:
  # Check continuity between DATP01 and system ground.
  - command: measure continuity DATP01 true
  # Check that there is no continuity between DDTP05 and system ground.
  - command: measure capacitance DDTP05 false
  # Check continuity between DATP02 and GND3.
  - command: measure capacitance DATP02 true
    ground: GND3
Example PLT test plan: Measure Continuity DATP00 and DATP01
title: Measure Continuity DATP00 and DATP01
suite:
- title: Measure Continuity DATP00 and DATP01
  steps:
  # Route DATP00 to MUX0 and DATP01 to MUX1
  - command: mux 0 DATP00
  - command: mux connect DATP00
  - command: mux 1 RVREF
  # Connect MUX0 and MUX1
  - command: short 0 1 set
  # Check continuity between DATP01 and system ground.
  - command: measure continuity DATP01 true
    ground: RVREF

Commands

Digital

Use the measure command with the pin channel to test the value of digital inputs.

Example PLT test plan: Digital pin measurements
title: Digital pin measurements
suite:
- ident: ICT-T1
  title: Configure Digital pins as inputs
  steps:
  - command: pin RDTP21 input pullup
  - command: pin DDTP04 input
- ident: ICT-T2
  title: Read Digital pins
  steps:
  - command: measure pin RDTP21 low
  - command: measure pin DDTP04 high

Commands

Frequency

Use the measure command with the frequency channel to test measure frequency.

The frequency measurement will be performed on either the CLK0 or CLK1 PLT signal, which must be selected with the freq command, before performing the measurement.

Example PLT test plan: Measure CLK0 frequency
 title: Measure CLK0 frequency
 suite:
 - title: Measure CLK0 frequency
   steps:
   - command: freq 0
   - command: sleepms 1000
   - command: measure frequency 32.75-32.78kHz
Example PLT test plan: Measure CLK1 frequency
 title: Measure CLK1 frequency
 suite:
 - title: Measure CLK1 frequency
   steps:
   - command: freq 1
   - command: sleepms 1000
   - command: measure frequency 7.90-8.10MHz

Measure frequency with duty cycle.

Note

Duty Cycle parameter only available on PLT-300A. Duty Cycle check only supported up to 60kHz.

Example PLT test plan: Measure CLK1 frequency with Duty Cycle
 title: Measure CLK1 frequency
 suite:
 - title: Measure CLK1 frequency
   steps:
   - command: freq 1
   - command: sleepms 1000
   - command: measure frequency 49.9-50.1KHz
     with:
     - dutyCycle 49-51%

Commands

See also

Continuous Measurement

The PLT can take continuous electrical measurements. Instead of a single measurement, signals are sampled continuously to evaluate mean, min, and max values over the sample period. This is particularly useful for characterizing a DUT with variable power consumption, such as a BLE or WiFi device.

Continuous Measurement is only available on the PLT-300A, and the measurement channel must support continuous measurement. Currently, the only supported continuous measurement channel is joulescope which requires a Joulescope JS220 connected to the PLT-300A.

Example PLT test plan: Measure DUT Power Consumption for 10 seconds using Joulescope
 title: Measure DUT Power Consumption
 suite:
 - title: Measure DUT Power Consumption
   steps:
   - command: measure start joulescope
     with:
     - voltageAverage:3-3.5V
     - voltageLimit:0-4V
     - currentAverage:10-20mA
     - currentLimit:0-100mA
     - powerAverage:30-50mW
     - powerLimit:0-100mW
   - command: sleepms 5000 "Measuring DUT power consumption..."
   - command: measure stop

Commands

See also