Electro-Metrics EM-2115, Instruction Manual

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EM-2115 4.0 SERVICE, MAINTENANCE, CALIBRATION
(EM2115S4-32)
3) Set the Main Tuning Control FULL CW.
4) The front panel Frequency Display should indicate the high end point of RF
Frequency Band 1 (0.035 MHz). If not, refer to Table 4.6 and adjust the compo-
nent listed under the "High" column for "Frequency Adjustments".
5) Repeat substeps 1 thru 4 until RF Frequency Band 1 meets the stated frequency
range specification.
c. Using an external Signal Generator, apply a 0.0022 MHz CW signal at an input
level of +40 dB(µV) to A2J4 (RF Input).
d. Tune the receiver for a maximum indication on the front panel analog meter, the
front panel digital meter should in40 dB(µV) ±1.0 dB.
"Only" when the
RF frequency band amplitude level does not meet the "stated specification lim-
its" should the following procedure be performed
.
1) Refer to Table 4.6 and adjust the component listed under the "Overall Gain"
column for "RF Adjustments" for +40 dB(µV) ±1.0 dB.
Table 4.6
RF Frequency Ranges 1-9 Adjustments
RF Fre-
quency
Range
Frequency Adjustments RF Adjustments
Low High Low High Overall
Gain
FR-1
A2A1
C10
0.009 MHz
C6
0.035 MHz
T0101
L0102
L0103 C1 R3
FR-2
A2A2
C8
0.035 MHz
C4
0.075 MHz
T0201
T0202
L0203 C1
C2
C3 R1
FR-3
A2A3
C8
0.075 MHz
C4
0.150 MHz
T0301
T0302
L0303 C1
C2
C3 R1
FR-4
A2A4
C9
0.120 MHz
C5
0.250 MHz
T0401
T0402
L0403 C1
C2
C3 R2
FR-5
A2A5
T0504
0.250 MHz
C7
0.500 MHz
T0501
L0502
L0503 C1
C2
C3 R2