The Gain Adjustment For Acv - Picotest M3500A Service Manual

6.4

The Gain Adjustment for ACV

Please follow the procedures A and B to do the adjustment.
A. To do ACV adjustment, the standard source with a required setting 1 KHz
needs to be connected, and the BAND WIDTH 20 Hz has to be selected by
pressing SHIFT > ACV > BAND WIDTH > NEXT > 20 Hz > ENTER. Then,
choose a specific range. And follow the next procedures to operate.
Set the standard input voltage at source side in 10 % relative to a

range with full scale on the M3500A, and the 10% value of the full
scale must be between the value multiplying 0.9 and 1.1. (For
instance, when users adjust the M3500A's AC range to 100 mV, the
output voltage of the standard source must be between 9 to 11 mV.
And the frequency must be 1 KHz.) Then lift the security by
pressing UNSECURED > NEXT > CALIBRATE > ENTER > And by
using the UP button in the Range area & NEXT button to input a
value which must be between the value multiplying 0.9 to 1.1 with
full scale. After that the M3500A will show a 10% value with full
scale. (For instance, the setting must be between +0.900000E-02
and +1.100000E-02 at the AC range 100 mV.) > ENTER to do the
adjustment.
After executing the adjustment of the 10% with full scale on the

M3500A, the display will show "input full scale". Please set the
standard input voltage at source side in 100 % relative to a range
with full scale on the M3500A, and the 100% value of the full scale
must be between the value multiplying 0.9 and 1.1. (For instance,
when users adjust the M3500A's AC range to 100 mV, the output
voltage of the standard source must be between 90 and 110 mV.
And the frequency must be 1 KHz.) Then by using the UP button in
the Range area & NEXT button to input a demand value which must
be 100% with full scale, and its value must be between multiplying
0.9 and 1.1. (For instance, the setting must be between
+0.900000E-01 and +1.100000E-01 at the AC range 100 mV.) >
ENTER to do the adjustment.
B. When it's done, the Display of the M3500A will show Cali OK. Users can
press ESC to exit. In addition, users have to note that...
When the ACV range 750V is selected, the 10% value of the full

scale multiplying 0.9 to 1.1 is between 67.5V and 82.5V. But the
100% value of the full scale multiplying 0.9 to 1.1 is only between
675V and 770V at most.
The ACI function adjustment is not supported.

Function Range
100mV to 100V
VDC
1000V
DCI 10mA to 1A
4WΩ 100Ω to 100MΩ
Input Value from Source
0.9 to 1.1 * full scale
900V to 1050V
0.9 to 1.1 * full scale
0.9 to 1.1 * full scale
87
Setting Value on M3500A
0.9 to 1.1 * full scale
900V to 1050V
0.9 to 1.1 * full scale
0.9 to 1.1 * full scale