ENDEVCO 2680
INSTRUCTION MANUAL
IM2680
Page 1-3
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_____________________________________________Output Characteristics______________________
DC Output Voltage
Minimum Linear Output___________
Biased
Input
Adjustable Residual
Unbiased Voltage
Unbiased Voltage
Current
(10kΩ
Model Charge
Gain Range Noise
Type
Biased (+0.50/
(≥10kΩ
>10kΩ
>1MΩ
Load at Min.
M No. Limit (pC) mV/pC
(mV rms) Output
(±3%)
-0.00)
Load)
Load
Load
Linear Voltage )
M 1
50 000
0.1 to 1.0
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 2
25 000
0.2 to 2.0
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 3
10 000
0.5 to 5.0
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 4
5 000
1.0 to 10
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 5
2 500
2.0 to 20
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 6
1 000
5.0 to 50
1.5
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M 7
500
10 to 100
2.0
Biased/
2.5 V 0.00 V 4.65 Vp-p 4.25 Vp-p 4.65 Vp-p 0.465 mA p-p
Unbiased
1.64 Vrms 1.5 Vrms 1.64 Vrms 0.164 mA rms
M12
Low
5 000
1.0 to 10
1.5
Biased
2.5 V 0.00 V 4.65 Vp-p
0.465 mA p-p
Gain
1.64 Vrms
0.164 mA rms
High
5 000
10 to 100
7.5
Biased
2.5 V 0.00 V 4.65 Vp-p
0.465 mA p-p
Gain
1.64 Vrms
0.164 mA rms
M14
Low
5 000
1.0 to 10
1.5
Unbiased 2.5 V 0.00 V
Limited at
0.500 mA p-p
Gain
5.00 Vp-p
0.177 mA rms
1.77 Vrms
High
5 000
10 to 100
7.5
Unbiased 2.5 V 0.00 V
Limited at
0.500 mA p-p
Gain
5.00 Vp-p
0.177 mA rms
1.77 Vrms
______________________________________________________________________________________________________
TABLE 1-2: INPUT/OUTPUT CHARACTERISTICS
4.
DC-TO-DC CONVERTER
A DC-to-DC Converter is installed in specific models of the Charge Amplifier (see Table 1-1) to
isolate power and signal grounds. The isolation of the grounds is required when power is noisy, or
when switching transients are present, or when separate grounds have already been established
in a measurement system.
5.
INPUT POWER
The Charge Amplifiers operate from a 20 to 32 V dc source (28 V typically). Each model may
vary in voltage range and input current requirements, this is dependent on the installation of a DC-
to-DC Converter. Refer to Table 1-1 for input voltage and current requirements for each Charge
Amplifier model and "M" series.
