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Model 4277A
SECTION IV
4-11.
TEST SiGNAL
4-12. This test verifies that test signal level for the 4277A meets the specified level
accuracy of 1096 .
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4277A
BNC to BNC
Coble
Figure 4-2. Test Signal Level Accuracy Test Setup.
EQUIPMENT:
RF Voltmeter .. HP 3403C and HP 400E
BNC to BNC Cable . HP11170A
Note
Use RF Voltmeter calibrated for frequency response of lOkHz to IMHz.
PROCEDURE:
1. Connect the 3403C to the 4277A UNKNOWN
Hcur
terminal as shown in Figure
4-2.
2. Set the RANGE control of the 3403C as appropriate to measure IVrms.
3. Set the 4277A's controls as follows:
DC BIAS switch ..... OFF
Test Frequency . lOkHz
TEST SIG LEVEL . HIGH
Other controls . Any setting
4. The 3403C should read between 0.9V and 1.IVrms.
5. Successively change the test frequency setting to lOOkHz and IMHz.
The
voltage readings on the 3403C should be within the test limits given in Table
4-3.
6. Replace the 3403C with the 400E. Set the TEST SIG LEVEL to LOW.
7. Set the test frequency in accordance with Table 4-3. Verify that the voltage
readings on the 400E meet the test limits given in the table.
Table 4-3. Test Signal Level Accuracy Test
Test Limits
Equipment
qu e n c y
Level
lOkHz
lOOkHz
IMHz
High (IVrms)
0.9 to 1.IVrms
0.9 to 1.IVrms
0.9 to 1.IVrms
HP 3403C
Low (20mVrms)
17 to 23mVrms
17 to 23mVrms
18 to 22mVrms
HP 400E
4-7
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