Atec Biddle-27000 - Manual (Page 4)

PARTIAL DISCHARGE DETECTION SYSTEMS
7. Automatic scope display synchro-
nization indicators
8. Calibrator controls and indicators
9. LCD partial discharge display
10. Partial discharge display channel
selector
11. pC trip level adjustment
12. Trip indication lamp
13. Window gating controls
14. Markers on/off for window gat-
ing
15. Pulse count per half cycle (for
noise control)
DETECTOR CONTROLS
1. Power switch on/off
2. CRT display adjustments
3. CRT display mode - sine wave or
eliptical
4. Amplifier gain controls
5. Remote indication for external
control
6. Marker indicates zero or negative
peak on CRT display waveform
SPECIFICATIONS
Input
Input Voltage
120/240 V (+10%, –17.5%), 47 to 500
Hz (selectable at the power input
receptacle)
Power Burden: 100 VA max.
Mechanical
Designed for 19-in. (48.3-cm) relay rack
mounting
Signal Connectors: BNC (MIL UG625)
Front-Panel Dimensions
7 H x 19 W in.
17.8 H x 48.3 W cm
Weight: 25 lb (11.3 kg)
Environmental
Storage Temperature Range
–40 to +149
°
F (–40 to +65
°
C)
Operating Temperature Range
32 to 122
°
F (0 to 50
°
C)
Relative Humidity
5 to 95% (noncondensing)
Maximum Altitude: 10,000 ft (3030 m)
CRT Display
3 x 4 in. (8 x 10 cm) with Z-axis modula-
tion
Cable Test Amplifier Specifications
Bandpass: 20 to 110 kHz at –3 dB
Gain: 92 dB at midband
Pulse Resolution Time: 5
±
1
µ
s
Negative Superposition: Less than
15%
Transformer Test Amplifier
Specifications
Bandpass: 75 to 290 kHz at –3 dB
Gain: 86 dB at midband
Analog Recording Outputs from
Evaluation Unit Channels
Peak partial discharge, average par-
tial discharge, apparent partial
discharge power loss: 0 to 5 Vdc
Serial Interface: RS-232C, 1200 baud,
RTS/CTS handshake
Calibrator
Output Range: 0.1 to 999 pC in three
ranges, continuously variable
Output Impedance: 75
Ω
Accuracy
±
1.5% full scale on 100-pC range
±
4% full scale on 10- and 1000-pC
ranges
Modes Provided: Direct in accordance
with IEC 270, ASTM D-1868, method
3; indirect, ASTM D-1868, method 4;
average channel
Vertical Deflection Linear Range
0 to 2.7 in. (0 to 7 cm)
Display Synchronization Range
47 to 500 Hz
Display Synchronization Modes
Power line
Test voltage
Automatic Display Synch Switchover
(from power line to test voltage)
At approx 5% of rated voltage
Display Sweep Modes
Ellipse
Sine wave
Flat line
Display Sweep Phase Markers
At negative-going zero crossing
At negative voltage peak
Display Pulse Characteristics
(available by internal jumper)
Negative polarity only
Positive polarity only
Both polarities (unrectified)
Amplifier
Analog Output: 1-volt output per cm of
deflection on CRT to maximum of 8 V
General-Purpose Amplifier
Specifications
Bandpass: 40 to 200 kHz at –3 dB
Gain: 86 dB at midband
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