Keysight 34972A User Manual

Tutorial 7
Keysight 34970A/34972A User’s Guide 303
Sources of Error in DC Current Measurements
When you connect the internal DMM in series with a test circuit to measure
current, a measurement error is introduced. The error is caused by the DMM’s
series burden voltage. A voltage is developed across the wiring resistance and
current shunt resistance of the internal DMM as shown below.
V
s
= Source voltage
R
s
= Source resistance
V
b
= Burden voltage
R = Current shunt resistance
Error (%) =
Sources of Error in AC Current Measurements
Burden voltage errors, which apply to DC current, also apply to AC current
measurements. However, the burden voltage for AC current is larger due to the
internal DMM’s series inductance and the measurement connections. The burden
voltage increases as the input frequency increases. Some circuits may oscillate
when performing current measurements due to the internal DMM’s series
inductance and the measurement connections.
V
s
R
s
V
b
R
DMM
100%– V
b
×
V
s
-------------------------------

Keysight 34972A Specifications

General

Model	34972A
Category	Data Acquisition/Switch Unit
Manufacturer	Keysight Technologies
Scan Rate	Up to 250 channels/sec
Voltage Measurement Range	100 mV to 300 V
Resistance Measurement Range	100 Ω to 100 MΩ
Operating Temperature	0 °C to 55 °C
Storage Temperature	-40 °C to 70 °C
Switching Modules	Supports plug-in modules
Current Measurement Range	1 µA to 1 A
Temperature Measurement	Thermocouples, RTDs, and Thermistors
Interface	USB, LAN
Memory	50, 000 readings
Weight	3.6 kg