Technical data

Calibration 3
U2761A Service Guide 33
1 Calibration constant is stored after completing this setup.
5 Proceed to DC offset adjustment or exit the calibration
mode when necessary.
DC Offset (High Impedance) Adjustment
The U2761A stores the calibration constant related to gain
and offset of the internal system DAC to control the offset
setting. This setting is used for both offset and DC outputs.
1 Set the DMM to measure DC voltage. Connect the DMM to
the U2761A as shown in Figure 3- 3. The DMM input
impedance should be set to 10 M
Ω.
2 Use the DMM to perform the DC voltage measurement at
the output terminal for each setup shown in the table
below.
3 Enter the measured value to the U2761A as described in
“Calibration Procedure” on page 30.
1 Calibration constant is stored after completing this setup.
Table 3-12 DC offset (High Impedance) adjustment configuration
U2761A DMM
Setup Amplifier DC offset Lower margin Measurement Upper margin
8 Off +4.800 VDC +4.608 VDC VDC +4.992 VDC
9Off
–4.800 VDC –4.992 VDC VDC –4.608 VDC
10 On +2.600 VDC +2.496 VDC VDC +2.704 VDC
11 On +4.800 VDC +4.608 VDC VDC +4.992 VDC
12 On –2.600 VDC –2.704 VDC VDC –2.496 VDC
13
1
On –4.800 VDC –4.992 VDC VDC –4.608 VDC