General
DC or AC coupled voltage amplifier with adjustable gain and a maximum freguency response extending from DC to 1 MHz. Single-ended or differential high-impedance input, and single-ended output, via BNC connectors.
Signal channel high and low pass filters with variable cut-off frequencies and slope may be switched into circuit to give an overall low-pass, high-pass, bandpass or flat response.
Computer control via optically isolated RS232 interface.
Battery powered from internal rechargeable batteries, which recharge when separate line power supply is connected.
| Inputs |
| Modes |
A or A-B |
| Coupling |
AC or DC |
Impedance
AC coupled
DC coupled |
either 10 MΩ or 100 MΩ in parallel with 25 pF and in series with 0.1 µF
either 10 MΩ or 100 MΩ in paralled with 25 pF |
Max input without Damage
DC coupled
AC coupled |
+ 10 V, -9 V
Coupling capacitors can withstand 100 V. Transients that pass through coupling capacitors must not exceed DC coupled operation limiits |
Max input for Linear Operation
Common mode
Differential mode |
1 V peak.
See Table 1 |
Common Mode Rejection Ratio, CM.R.R.
DC to 1 kHz
1 kHz to 1 MHz |
>120 dB
-6 dB/octave |
| Gain |
Coarse gain of x5 to x50,000 in 1-2-5 sequence with an accuracy of 1%. Fine gain extends range from x1 to x100,000 with an accuracy of 2%. An uncalibrated vemier provides gain adjustment of +20% of coarse gain |
| Overload Recovery |
Front-panel push button or computer command |
| Voltage Noise |
Typically 4 nV/√Hz at 1 kHz referred to input - see also noise contours on page 11 |
| Filters |
| Type |
One high-pass and one low-pass stage |
| Mode |
Low-pass, High-pass, Bandpass, Flat (No filter) |
Slope
Low pass
High pass
Bandpass |
6 or 12 dB/octave
6 or 12 dB/octave
6 dB/octave |
Frequency Response
Flat Mode
Low-pass
High-pass |
DC to 1 MHz.
-3 dB frequency selectable from 0.03 Hz to 300 kHz in a 1-3-10 sequence (Figure 1)
-3 dB frequency selectable from 0.03 Hz to 300 kHz in a 1-3-10 sequence (Figure 2) |
| DC Drift |
|
| Referred to Input (DC coupling) |
Maximum 10µ/º or less than 10 µV/º c or less than 10µV per 24 hours at constant ambient temperature |
| Referred to Output (AC coupling) |
|
Course gain only
With Fine Gain |
75 µV/º C
250 µv/º C maximum |
| DC Input Offset Control |
Front-panel screwdriver control provides for DC zeroing |
| Output |
| Max Output Voltage |
2 V pk-pk ahead of 50 Ω |
| Output imipedance |
50 Ω ± 2 % |
| Computer Interface |
| Type |
Opto-isolated RS232 |
| Connector |
DB25 25-pin female connector |
| Baud Rate |
300 to 9600 baud |
| Parameters |
No parity, eight data bits and one stop bit |