Sennheiser SK 250 User Manual download pdf (Page 20)

SK 50 UHF / SK 250 UHF

01 / 93 – 20

NOTES:

No. Measurement,

adjustment

Signal

input

Preparations,

settings

Test point Desired value Adjuster Remarks

12.1 Sensitivity – 6 dB

– 12 dB

– 18 dB

– 24 dB

– 30 dB

– 36 dB

– 42 dB

S2 pos. "2"

S2 pos. "3"

S2 pos. "4"

S2 pos. "5"

S2 pos. "6"

S2 pos. "7"

S2 pos. "8"

J2 0 dB

tol. ± 1 dB

13 Control amplifier Connect AF

generator

to input J1:

12 mV / 1 kHz

= 0 dB

S2 pos. "8";

mod. analyzer;

UPM 550 - 1

J2 Dev.: ± 56 kHz;

tol. ± 1 dB

= 0 dB

LED D11

lights

13.1 Control amplifier Connect AF

generator

to input J1:

+ 30 dB

As 13. J2 Dev.:

max. + 1 dB

Signal remains

sinusoidal; attack

time approx. 5 ms

14 S/N ratio As 13. As 13. J2 Dev.: ± 56 kHz

0 dBAeff

14.1 S/N ratio Remove AF

generator,

short-circuit J1

As 13. J2 – 40 dBAeff

14.2 S/N ratio As 14.1. S2 pos. "1" J2 – 60 dBAeff

15 DC / DC converter

test

Connect AF

generator

to input J1:

0.775 V / 1 kHz

S2 pos. "1";

SK 250-UBat 2.8 V;

SK 50-UBat 2.0 V

J2 Use

headphone

to monitor AF

signal

No audible hiss

16 THD As 15. UBat 3.9 V;

UPM 550 - 1

J2 THD ≤ 0.3 %

17 Precise

RF adjustment

Remove AF

generator;

connect tracking

generator

– 6 dBm to

TP15 and TP16

Remove C33;

put transmitter into

shielding housing;

spectrum analyzer

J2 Bmin. 30 MHz;

SK 250 =

U ≥ +23 dBm

SK 50 =

U ≥ +15.5 dBm

C45, (C46),

C53, C54

18 RF output power Remove tracking

generator; take

transmitter out of

housing; solder

C33 in proper

position; put trans-

mitter into housing;

power meter

J2 250 =

200 - 250 mW

50 =

25 - 50 mW

250 = R65

50 = R51

Observe current

consumption

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Sennheiser SK 250 User Manual Page 20

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