NF ZM2376 - DC Bias Voltage Accuracy

6.6 Performance Testing
6-7 ZM2376
6.6.4 DC Bias Voltage Accuracy
Connection: H
CUR
and H
POT
terminals together  AC voltmeter input (- terminal)
L
CUR
and L
POT
terminals together  AC voltmeter input (+ terminal)
For the connection, use a kelvin clip test leads (2325AL, etc.).
To use the coaxial cable, connect 4 shields all together.
Kelvin clip H terminal + terminal AC voltmeter
test leads, etc. L terminal - terminal
Setting: After initializing the setting, set the measurement frequency to 1kHz (initial value)
and the measurement signal level to 0.1Vrms.
Press the _BIAS_ key to display the DC Bias setting menu, and turn on the DC Bias.
Set the DC Bias voltage according to the contents in table stated below in order of
precedence.
Measurement: Measure the DC Bias voltage with the DC voltmeter which is fixed at 10V range.
As the AC voltage is superimposed, correct measurement may not be performed if
the automatic range is enabled on the voltmeter.
Evaluation: If the values on DC voltmeter are within the specification range of table, it is
normal.
Values indicated on DC voltmeter
Specification: ± (2% + 5mV)
DC bias voltage
0.000 V
-0.0050 V to +0.0050 V
1.000 V
-1.0250 V to -0.9750 V
2.500 V
-2.555 V to -2.445 V
5.000 V
-5.105 V to -4.895 V
CAUTION: The polarity is inversed due to the connection.