Trig-Tek Inc. 203M Charge Amplifier
Input
Connector: BNC
Charge Sensitivity: 1 to 110 mV or pC/g (two selectable ranges “1-11” and “10-110” with continuous adjustment)
Frequency Response: ±3% from 5 Hz to 30,000 Hz (referenced to 100 Hz)
Overload Recovery: Input pulses ≤ 10,000 pC, 1 ms half-sine — no effect on output except clipping
Amplitude stability vs input capacitance: < 0.1% change per 1000 pF
Amplitude stability vs temperature: < 3% change from 30° to 130° F
Shunt Resistance: operates with any input impedance above 100 kΩ
Filtering: 12 dB/oct roll-off; selectable low-pass filter cutoffs at 3 kHz, 10 kHz, or 30 kHz (other cutoffs available on request)
Acceleration Output (NOR and AUX)
Voltage (Max): 10 Vrms
Sensitivity: 10 mV/g or 100 mV/g
Output Impedance: < 50 Ω (max 10 mA)
Amplitude Linearity: ±1% of best straight-line approximation (output vs input amplitude)
Amplitude Accuracy: ±2% of reading ±1% full scale (when used with selected low-pass filter)
Noise: 0.05 pC max with 1.0 pC/g sensitivity; increases by 0.007 g per 1000 pF added input capacitance
Harmonic Distortion: < 1%
DC Offset: < 5 mV
Velocity Output
Voltage (Max): 10 Vrms
Sensitivity: 10 mV/ips
Impedance: < 50 Ω (max 10 mA)
Frequency Response: ±3% from 5 Hz to 30,000 Hz (with –6 dB/oct slope), in series with selected input low-pass filter
Dynamic Range: 46 dB below full scale
DC Offset: < 5 mV
Displacement Output
Output Level: 0 to 10 Vrms
Impedance: < 50 Ω (max 20 mA)
Sensitivity: 10 mV/mil DA
Amplitude Accuracy: ±5% of reading ±0.5% full scale
Frequency Response: ±3% from 10 Hz to 10,000 Hz with –12 dB/oct slope; or ±5% from 5 Hz to 3000 Hz with –12 dB/oct slope (with selected low-pass filter)
Dynamic Range: 36 dB below full scale
DC Offset: < 5 mV (note: noise signal should be averaged)
DC Output (meter range)
Level: 10 VDC full scale
Impedance: < 50 Ω (max 10 mA)
Sensitivity: 10 V for selected full scale
Linearity: 1% full scale
Amplitude Accuracy: 2% of reading ±1% full scale
Dynamic Range (Accel): 60 dB below full scale
Interface / Power
Power: 115 or 230 V AC, ±10%, 50 to 400 Hz, nominal 3 W
Controls (on front panel)
Filter Switch: selects “Lo”, “Med”, “Hi” low-pass filter (cutoff frequencies 3 kHz, 10 kHz, 30 kHz)
Cal-Oper Switch: connects amplifier input to either internal calibrator signal or normal accel input
mV/g Output Switch: selects 10 or 100 mV/g output
pC/g – mV/g Switch: selects input type (pC/g for standard accelerometers, mV/g for those with built-in electronics)
Sensitivity Switch: selects “1-11” or “10-110” mV/g or pC/g
Sensitivity Dial: adjusts charge sensitivity continuously 1 to 11 for each range
Units Switch: selects meter units (g’s, ips, or MILS)
Full Scale (FS) Switch: selects 10, 100, or 1000 units as full scale for meter
RMS-Peak Switch: scales front-panel DVM for either peak or RMS units at input
Alarm Set Switch: monitor/reset alarm set point
SE-DIFF Switch: selects single-ended or differential input configuration
Read-Hold Switch: “Read” locks Pk-Hold circuit value to meter; “Erase” resets Pk-Hold to zero
Indicators
Cal Light: illuminates when “Cal” mode selected
Alarm Light: illuminates when alarm set point exceeded
Mechanical
Dimensions: 7" H × 2.7" W × 13" D (17.8 cm × 6.9 cm × 33 cm)
Up to six units side-by-side in a standard 19" rack
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