BRUEL & KJAER 1024 - Meter Circuit Adjustments; Mechanical Zero-point Calibration; Meter Circuit Balance Adjustment; Sensitivity Verification

BROH & KJ.ER
NCllrum - Denmark
1. 1. h\echanical Zero-pojnt
1
.2. tv\eter Circuit Balance
MATCHING IMP.: "600"
COMPRESSOR SPEED: "OIP'
SWITCH 07: "Scanning Off"
BANDWIDTH SELECTOR: "S ine"
METER SWITCH: "0.3 sec. Output Vo l t."
FREQUENCY SCALE: "1000 Hz"
1 .3 . Sensitivity
MATCHING IMP.: "600"
COMPRESSOR SPEED: "OIP'
SWITCH 07: "Scanning Off"
BANDWIDTH SELECTOR: "Sine"
METER SWITC H: "0 .3 sec . Output Volt . "
FREQUENCY SCALE: "1000 Hz"
1.4 . Meter Time Const.
MATCHING IMP . : "600"
COMPRESSOR SPEED: "Off"
SWITCH 07: "Scanning Off"
BANDWIDTH SELECTOR: "Sine"
METER SWITCH: "0 .3 s ec . Output Vo lt . "
FREQUENCY SCALE: "1000 Hz"
1.5. Voltage Divider
MATCHING IMP.: "600"
COMPRESSOR SPEED: "Off"
SWITCH 07: "Scanning Off"
BAND WI DTH SELECTOR: "Sine"
METER SWITCH: "0 .3 sec. Output Volt ."
FREQUENCY SCALE: "1000 Hz "
1024.1 - 1 .65
Meter Circuit
1024.1
vol id from seriol no. 13h$.81
Adju st for 0 with no power on.
Adjust the OUTPUT LE VEL lor a 10 V dellection on type 1024. Check that
the voltages across R 84 and R 85 are equal (appro x. 7 V).
By unbalance: N\easure the voltage across R 85 and adjust P 5 for the same
voltage across R 84.
Adjust the OUTPUT LEVEL to exactly 10 V on type 2107 .
Deflection
on type 1024: 10 V.
If necessary adjust P 4.
Adjust th e OUTPUT LE V EL for 0 10 V deflection on type 1024 and check the
time constant lor
all OUTPUT V OLTAGE pasition 01 METER SWITCH .
Tolerance: t 20 %.
By the meter time constant is meant the ti me it tokes for the meter pointer to
fall from 10 V to 3 .4 V deflection when the input signal is disconnected
(GENERATOR STOP pushed-in).
Adjust the
OUTPUT LEVEL lar a 10 V deflection an type 1024.
Check the deflection
on type 1024 in all positions 01 MATCHING IMP. by
comparison to type 2107.
Tolerance:
± 2% (+ tolerance 01 2107: 2%).