Giga-tronics 2508A, Operation Manual

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Performance Verification
2500A Series Operation Manual, 34172 Revision C, March 2008
4.3.2 Performance Tests: All 2500A Series
The performance tests in this section apply to all 2500A Series instruments.
4.3.2.1 Frequency Range, Resolution & Accuracy
In this test, the RF output of the 2500A is connected to the input of a frequency counter, and the 2500A’s
output frequency is tested at various points within its frequency range. The internal timebase of the
counter is used as a reference for the 2500A to eliminate timebase errors from the measurements.
4.3.2.1.1 Equipment Required
• Microwave Frequency Counter
4.3.2.1.2 Test Setup
Figure 4-1: Frequency Range, Resolution & Accuracy Test Setup
4.3.2.1.3 Procedure
1. Connect the equipment as shown in Figure 4-1. Connect the 2500A RF Output to the low frequency
input using coaxial cabling and adapters as is necessary. Allow the equipment to warm up for at least
30 minutes. Because the 2500A and the counter use the same timebase, timebase errors are elimi-
nated. The 2500A automatically switches to the external reference when it is connected.
2. Set the 2500A for an output frequency of 10 MHz, and set the RF output level to 0 dBm.
3. Press the [RF ON] button to activate the 2500A output.
The indicator above the RF ON button is blue when the 2500A output is active.
4. Set the 2500A to each frequency listed in Datasheet 1, and verify that the counter reads the set fre-
quency plus or minus the counter resolution.
5. When the test frequency exceeds the maximum frequency of the input, move the 2500A RF Output
to the high frequency Input on the frequency counter.
IN
>1 GHz
<1 GHz
Frequency Counter
OUT
RF OUT
MICROWAVE SYNTHESIZER (UUT)
Timebase
RF IN
(Series 2500A Series Illustrated)
2500A Microwave Synthesizer