Rohde & Schwarz 890 Series - A1.8 Setting the AF2 Output Level; A1.8.1; A1.8.2; Procedure

V L F > H F R E C E I V E R S f R & S E K 8 9 5 / R & S E K 8 9 6
User Manual f Altering the AF2 Output Level
A1.8 Setting the AF2 Output Level
A1.8.1 Required Test Equipment
f Voltmeter URE 342.1214.02
f Signal Generator SMK 348.0010.03
A1.8.2 Procedure
1. Switch off VLF>HF receiver.
2. Undo and remove four screws (1, Fig. A1.3
(EK!895) or Fig. A1.4 (EK!896)) fixing the
rear panel stands.
3. Remove rear panel stands.
4. Remove covers by means of a screw driver.
5. Disconnect RF cable from antenna socket
(see Fig. A1.2).
6. Disconnect AF line from female connector
strip OUTPUT.
7. Connect signal generator to antenna
socket.
8. Switch on signal generator.
9. On signal generator set a frequency of
5.001 MHz and a level of 1!mV
EMF
.
10. Switch on VLF>HF receiver.
11. On VLF>HF receiver set a frequency of
5.000!MHz and modulation mode USB.
12. By means of voltmeter measure level via
600 ‡ at contacts X66.24 (AF2a) and X66.21
(AF2b).
Nominal value: 0 dBm
Adjust output level to 0 dBm by means of
variable resistor LINE2 (>10 to +10 dBm,
see Fig. A1.5 (EK 895) or Fig. A1.6 (EK 896)),
as necessary.
13. Perform steps 1 to 10 in the reverse order.
Fig. A1.2 Test Setup
Signal
Generator
Volt>
meter
6164.0717.02_01
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