High accuracy, low-noise, and seamless integration with 3rd party software makes myLab Precision Volt-meter with Power Supply an indispensable instrument in your laboratory and automated test environments (ATE). It is small and 10-times more cost effective than competitive instruments, suitable for multi-channel applications. Need a different function or a special function, then just select a another configuration.
Volt-meter input is available via Sensor Jack connector via three pins, and the 4th pin is the power supply.
Measurements are taken differentialy between the High and Low input terminals. To the Low terminal a selectable bias voltage can be applied in the range 0..4 V to be able to measure negative voltages.
In isolated USB environment make sure that the GND terminal is connected
to your target reference in the case of differential (balanced) measurements,
or that Input.Low = Bias
mode is used, to set the reference voltage potential.
To remove noise we suggest to use a shielded cable, terminated to the GND pin at Jack side only, and a twisted pair for High and Low signals. An example of such cable represents a standard usb cable as shown below:
myLab Voltmeter programming interface is inspired by a Standard Commands for Programmable Instruments (SCPI). Commands, states, and readings are sorted in a structure as described in the following sub-sections. Values represented in italic format can only be read, not settable. Values in <…> are numerical values.
Trigger.Source = Single
then query this parameter to perform
a conversion.Measurement.Voltage
copied from the USB.UTClock
at the time A/D sample is available.Input.Low
settings. When Input.Low = Float
, then Input.Type
becomes Balanced
,
otherwise Unbalanced.Input.Bias
value. When in Bias mode the
Low input is connected to a Bias source via 17 kOhm resistance.Input.Low = Bias
.Sense.Voltage.NPLCycles
settings.
It cannot be entered.System.LFrequency
.Sense.Voltage.NPLCycles
.Measurements.UTClock
.Parameter | min | typ | max | Unit | Notes |
---|---|---|---|---|---|
Voltage Measurement Range | -0.1 | Vusb-0.7 | V | Vusb is USB voltage (1) | |
Optional Output Reference | 0.000 | 4.016 | V | ||
Effective A/D Resolution | 19.5 | bits | Differential Delta-Sigma | ||
Voltage Resolution | 11.7 | uV | One LSB | ||
Measurement Accuracy | 0.02 | 0.01 | % | Adjusted | |
Long Term Stability | % | TBD | |||
Input Impedance | 10 | MOhm | Balanced | ||
Sample Rate at 16-bit | 11000 | sps | To be supported in FW | ||
Sample Rate at 18-bit | 2400 | sps | To be supported in FW | ||
Sample Rate (no AC rejection) | 22 | 178 | sps | 178 to be supported in FW | |
Sample Rate (50 HZ rejection) | 6.25 | sps | |||
Sample Rate (60 HZ rejection) | 7.5 | sps | |||
Noise, N=1 (no averaging) | 17 | LSB | Peak-to-Peak | ||
Noise, N=2 (averaging) | 14 | LSB | Peak-to-Peak | ||
Noise, N=4 (averaging) | 7 | LSB | Peak-to-Peak | ||
Noise, N=10 (averaging) | 5 | LSB | Peak-to-Peak |
Notes:
Parameter | min | typ | max | Unit | Notes |
---|---|---|---|---|---|
Power Supply Voltage Range | 0 | 23 | V | ||
Power Supply Current Range | 0 | 500 | mA | Total power of 2 W | |
Output Resolution | 20 | mV | |||
Output Accuracy | 50 | mV |
Stresses beyond these specifications may cause a harmful damage to the myLab.
Parameter | min | typ | max | Unit | Notes |
---|---|---|---|---|---|
Voltage Measurement Range | -0.5 | Vusb+0.5 | V | Vusb is USB voltage | |
Optional Output Reference | -0.5 | Vusb+0.5 | V |