Precision Process Calibrator
Calibration Adjustment
27
CURRENT
OUTPUT
HI
VOLTS
mA
RTD/
OUTPUT
HI
LO
HI
LO
LO
SENSE
4W RTD/
INPUT
20 V PK
MAX
100 V MAX
100 mA MAX
20 V PK
MAX
PRECISION PROCESS CALIBRATOR
7526A
7526A
8508A
gxm020.eps
Figure 12. DC Volts Source Performance Test Connections
Enter
2
on the PC to choose the 1 V source calibration.
The value for the first calibration point (approximately 0 V) will be sourced by the
Product. When the output is stable, type the value shown on the DMM. After the value is
entered, the value for the second calibration point (approximately 1 V) will be sourced by
Product. Type the new value to complete the 1 V source calibration.
Step 5: 100 mA Source - DC Current Source Adjustment
The dc current output adjustment uses similar calibration steps to the voltage source
calibration. The adjustment is done in two parts. The first part sets the zero and span
values. The second part fine adjusts the zero, span and the linearity if necessary. Table 3
for the test equipment used for this procedure. See Figure 13 for connections.
CURRENT
OUTPUT
HI
VOLTS
mA
RTD/
OUTPUT
HI
LO
HI
LO
LO
SENSE
4W RTD/
INPUT
20 V PK
MAX
100 V MAX
100 mA MAX
20 V PK
MAX
PRECISION PROCESS CALIBRATO
7526A
742A
8508A
7526A
gxm023.eps
Figure 13. High and Low Ohms Adjustment Connections
The voltage is measured across a 10
Ω
shunt resistor instead of measuring current
directly. Readings from the DMM must be converted to mA (multiplied by 100) before
they can be entered with the PC. Set the DMM to read DC Volts.
Summary of Contents for 7526A
Page 6: ...7526A Calibration Manual iv ...
