BC-535 Preliminary, Rev. 060126
30
Specifications
Noise:
Measured with 8 pole Bessel filter at specified cutoff frequency
Frequency range
Open input
100 pF at input
DC to 1 kHz
0.060 pA RMS
0.82 pA RMS
DC to 100 Hz
0.009 pA RMS
0.28 pA RMS
Bandwidth:
75 kHz
Input commands:
HOLD
:
Digital; 1 or 10 mV steps to
±
400 mV maximum
COMMAND IN
:
Front and rear external input, 10 V/V (applied voltage is attenuated
by 10/100/1000 at the command electrode)
Junction zero:
AutoZero or manual adjust. Offset lockout feature. Cycle time 1.5 s. Correction to
±
120
mV
Audio:
VCO with off switch and volume control. Internal speaker, and external speaker output.
Capacitance test:
Triangle wave applied to command electrode. Derived membrane capacitance displayed
on meter up to 1000 pF. Calibrated (1 mV/pF) square wave available at I
m
output. Cap
Sync (rear panel) synchronized with input triangle wave.
Gain:
Membrane current gain selectable from 0.5 to 1000 mV/pA in 1-2-5 steps.
Filter:
4-pole Bessel, selectable from 0.5 to 200 kHz in 1-2-5 steps, or bypassed for full amplifier
bandwidth.
Capacity
compensation:
FAST
(0-10
µ
s) and
SLOW
(0-10 ms) with adjustment of amplitude and time constant for
each range. Maximum compensation 500 pF.
Headstage:
Switching
Low current mode
50 G
Ω
feedback, 100 pA maximum current
High current mode
500 M
Ω
feedback, 2 nA maximum current
I/O:
Front panel:
Command Input:
BNC input up to 10 V. Attenuated by 10, 100, or 1000.
I
m
output:
Membrane current scaled by amplifier gain setting.
V
c
×
10 output:
Applied command voltage
×
10
Rear
panel:
I
m
output:
Membrane current scaled by amplifier gain setting.
Cap Sync:
TTL compatible
Capacitance
output:
Reports calculated membrane capacitance scaled to 1 mV/pF
Command Input:
BNC input up to 10 V. Attenuated by 10, 100, or 1000.
Gain telegraph:
Stepped DC voltage 0.5 to 5.5 V in 0.5 V steps for gain
settings of 0.5 to 1000 mV/pA. Telegraph value of 0 V for
standby mode.
Filter telegraph:
Stepped DC voltage 0.5 to 4.5 V in 0.5 V steps for filter
settings of 0.05 to 20 kHz. Telegraph value of 5.0 V for full
bandwidth (bypass) mode
External speaker:
Standard RCA jack
Warner
Instruments
A Harvard Apparatus Company .