Product Overview
4-channel Bipolar Picoammeter
with Analog Monitors and Bias Voltage
The AH501D is the new high-resolution bipolar picoammeter with 4-channel simultaneous
inputs, analog voltage monitors and an integrated bias voltage source.
It has been especially designed as the turnkey solution for photon BPM systems as diamond
detectors, ion chambers and blade gap-monitors.
t From ± 2.5 nA to ± 2.5 mA current
t Up to 26 kHz sampling frequency
t 24-bit ADC conversion
t Analog voltage monitors
t Integrated Bias voltage source (up to
t Less than 200 fA full-scale range noise
t 4-channel simultaneous sampling
t Ethernet 10/100 standard interface
t Beam Position Monitoring
t Ion Chambers Reading
t pH - metering
The AH501D is a 4-channel low
noise and fast sampling rate bipolar
picoammeter with an integrated
bias voltage source and voltage
analog monitors. It is composed by a
transimpedance input stage for current
sensing combined with a buffered
output voltage circuit that allows users
to monitor the input current behavior
and level with a simple oscilloscope or
a tester.
This device performs bipolar current
measurements from ±2.5 nA (with a
resolution of 300 aA) up to ±2.5 mA
(resolution of 300 pA) with a minimum
sampling period of 38.4 μA (equivalent
to 26 kHz, for 1 channel and a 16-bit
t Ultra-Low Current Measurements
t Diamond Detectors Readout
t Radiation Monitoring
The simultaneous sampling of the
4 independent channels makes
this instrument ideal for beam
position monitoring applications or
multichannel acquisition.
The presence of an internal lownoise (0.003% of full scale) voltage
source, ranging from 0 to 30V, makes
it extremely useful when using blade
gap-monitors or diamond detectors
needing a bias potential in order to
increase the signal intensity and thus
the signal-to-noise ratio. This built-in
bias voltage source signal is available
on a BNC connector and can also be set
to a high-impedance state.
The AH501D is housed in a light and
extremely compact box that can be
placed close to the signal sources in
order to reduce cable lengths and to
minimize possible noise pick-up on the
biasing and measuring signal paths.
Low temperature drifts, good linearity
and very low noise levels enable users
to perform very high precision current
The AH501D picoammeter has an
Ethernet 10/100 communication
interface (TCP-IP and UDP) that allows
easy instrument control with several
programming languages and operating
The AH501D has an external TRIGGER/
GATE input signal on a coaxial LEMO
connector in order to synchronize the
acquisition of the picoammeter with
external events (e.g. laser triggering).
Furthermore, as for the other members
of the CAENels picoammeter family,
digital samples can be transferred either
using ASCII format or RAW binary data
format for fast data transmission.
About CAENels
CAENels is a dynamic company that
provides power supplies and state-of-the-art
Technical Specifications
dedicated electronic systems to the particle
accelerator community - e.g. synchrotron
light sources and Free Electron Laser (FEL)
CAEN els d.o.o.
Input Channels
Current Measuring Range
Voltage Monitors
Current Polarity
Data rate
Resolution Bits
Noise (@RNG2, CIN = 5pF)
Communication Interface
I/O Signal
Supply Voltage
Bias Voltage Output
Bias Voltage RMS Noise
Input Connectors
Voltage Monitor Connectors
Status Indicators
from ±2.5 nA to ±2.5 mA
Yes (±5 V)
up to 26 ksamples/s
16 or 24
150 fA (typ.)
Ethernet 10/100 TCP/IP and UDP
TRIGGER/GATE input, CONV output
from ±6 V to ±15 V
0 to 30 V
155 x 165 x 50 mm
500 g
5 LEDs
Kraška ulica, 2
6210 - Sežana
Phone +386 (0)5 7313 585
Fax +386 (0)5 7313 587
[email protected]
AH501D Rear view
Copyright © CAENels d.o.o. - 2013
All rights reserved. Information in this publication supersedes
all earlier versions. Specifications subject to change without
Printed in May 2013