Fluke 225C Service Manual - Page 65

Input B LF-HF Gain, Continue

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5 Calibration Adjustment 5.6 Final Calibration 2. The display must show step CL 0654. If it does not, then press or to select the first calibration step in Table 5-1. 3. Set the 5500A SCOPE output to source the signal required for the first calibration point in Table 5-1. 4. Set the 5500A in operate (OPR) or standby (STBY) as indicated. 5. Press to start the calibration. 6. Wait until the display shows calibration status :READY . 7. Press to select the next calibration step, set the 5500A to the next calibration point signal, and start the calibration. Continue through all calibration points of Table 5-1. 8. When you are finished, set the 5500A to Standby. 9. Continue at Section 5.6.2. Cal step CL 0654 CL 0400 CL 0704 CL 0420 CL 0480 CL 0481 Table 5-1. Input A LF-HF Gain Calibration Points UUT input signal none 0.5 Vpp square wave, 1 kHz none 0.5 Vpp square wave, 1 kHz 0.5 Vpp sine wave, 50 kHz 0.5 Vpp sine wave Fluke 199B-C, 225C: 221 MHz Fluke 196B-C, 215C: 141 MHz Fluke 192B-C: 91 MHz 5500A Setting STANDBY SCOPE edge, 0.5 Vpp, 1 kHz STANDBY SCOPE edge, 0.5 Vpp, 1 kHz SCOPE levsine, 0.5 Vpp, 50 kHz SCOPE levsine, 0.5 Vpp, 221 MHz 141 MHz 91 MHz 5.6.2 Input B LF-HF Gain Proceed as follows to do the Input B LF-HF Gain calibration: 1. Press to select the first calibration step in Table 5-2. 2. Connect the test tool to the 5500A as shown in Figure 5-4. 5-9

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Calibration Adjustment
5.6 Final Calibration
5
5-9
2.
The display must show step CL 0654.
If it does not, then press
or
to
select the first calibration step in Table 5-1.
3.
Set the 5500A SCOPE output to source the signal required for the first calibration
point in Table 5-1.
4.
Set the 5500A in operate (OPR) or standby (STBY) as indicated.
5.
Press
to start the calibration.
6.
Wait until the display shows calibration status
:READY
.
7.
Press
to select the next calibration step, set the 5500A to the next calibration
point signal, and start the calibration.
Continue through all calibration points of Table 5-1.
8.
When you are finished, set the 5500A to Standby.
9.
Continue at Section 5.6.2.
Table 5-1. Input A LF-HF Gain Calibration Points
Cal step
UUT input signal
5500A Setting
CL 0654
none
STANDBY
CL 0400
0.5 Vpp square wave, 1 kHz
SCOPE edge, 0.5 Vpp, 1 kHz
CL 0704
none
STANDBY
CL 0420
0.5 Vpp square wave, 1 kHz
SCOPE edge, 0.5 Vpp, 1 kHz
CL 0480
0.5 Vpp sine wave, 50 kHz
SCOPE levsine, 0.5 Vpp, 50 kHz
CL 0481
0.5 Vpp sine wave
Fluke 199B-C, 225C: 221 MHz
Fluke 196B-C, 215C: 141 MHz
Fluke 192B-C:
91 MHz
SCOPE levsine, 0.5 Vpp,
221 MHz
141 MHz
91 MHz
5.6.2 Input B LF-HF Gain
Proceed as follows to do the Input B LF-HF Gain calibration:
1.
Press
to select the first calibration step in Table 5-2.
2.
Connect the test tool to the 5500A as shown in Figure 5-4.