HP 53181A - Mhz External Timebase Input

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification
Assembly-Level Service Guide 1-13
1
1 MHz External Timebase Input (HP 53131A and HP 53181A
Only)
1 Connect the equipment as shown in Figure 1-4.
Figure 1-4. External Timebase Test Setup
2Cycle the POWER key to preset the Counter.
3 Set Synthesizer #1 (i.e., the HP 3325B connected to the rear-panel
Ref In input of the Counter via a 50
Ω
feedthrough) to output a
1 MHz, 200 mV rms sine wave signal.
4 Set Synthesizer #2 (i.e., the HP 3325B connected to Channel 1) to
output a 2 MHz, 100 mV rms square wave signal.
Verify the Counter displays a reading of approximately 2 MHz and the
ExtRef annunciator is lit.
5 For HP 53131A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 8a.
Counter
Output
Channel 1
50Ω
Feedthrough
Ref. In
(rear panel)
HP 3325B
Synthesizer #1
Output
HP 3325B
Synthesizer #2