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MODEL
HZP
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The HZP High
Impedance Probe is intended to provide very high input impedance
when interfacing microelectrodes and other high impedance devices
to Grass amplifiers. It is generally intended for extracellular
microelectrode recording applications, but can be used for interfacing
other high impedance devices. The unit also incorporates a switching
circuit that provides selection of either recording or stimulating
through the same electrode.
The HZP is housed
in a small metal package and powered from two lithium batteries.
The Input terminals and Stimulus terminals are miniature binding
posts, which accept 2 mm diameter terminals and bare leads. The
output is a small diameter cable with SAFELEAD® 1.5 mm diameter
terminals. There are two switches, a power switch for the probe
and a Record/Stimulate switch.
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| SPECIFICATIONS |
| Probe |
|
Two
identical direct coupled inputs |
| Input
Signal Voltage |
|
Maximum of ±3 volts between the two input terminals |
| Input
Impedance |
|
2
x 1012 ohms minimum, differential
1012 ohms single-ended
(each input)
10 pF capacitance, each input |
| Current |
|
10-12
amperes each input |
| CMRR |
|
25,000:1
(>80 dB) |
| Noise |
|
Depends
on electrode impedance and bandwidth (13 µV peak-to-peak RTI,
inputs shorted, 10 kHz bandwidth) |
| Gain |
|
Unity,
between 0.995 and 1.0 |
| Power |
|
From
two internal 3.0 volt lithium batteries |
| Physical
Size |
|
1.5"
W x 1.875" H x 3.625" L
(3.8 cm x 4.8 cm x 9.2 cm) |
| Weight |
|
6
oz. (0.17 kg) |
| Cable |
|
2-foot
(61 cm) output cable terminating in three 1.5 mm diameter SAFELEAD
terminals |
| ORDERING
INFORMATION |
| Model
HZP |
|
High
Impedance Probe, single channel |
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| MODEL
15BIHIP |
| The
15BIHIP Bipolar High Impedance Probe is a compact accessory
module designed to preserve the frequency response characteristics
of Grass Model 15 Neurodata Acquisition System when interfaced
with high impedance electrodes. The module improves the input
characteristics when microelectrodes are used. The 15BIHIP
is housed in a small plastic box.
The 15BIHIP consists of 32 active high impedance devices,
two for each
of the 16 Model 15 AC Amplifier channels, arranged in a bipolar
(differential) fashion.
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The compact unit
is designed to substitute for the Model F-15EB/B1 and F-15EB/B2 Electrode
boards supplied with the Model 15 systems. The 37-pin D-connector
on the unit mates with the standard input cable provided with the
Model 15. A second cable provides power to the unit from the Model
15 Amplifier system.
The 32 inputs are committed in pairs to a maximum of 16 channels:
i.e., Channel 1 , G1, G2; Channel 2, G1, G2, etc. |
| SPECIFICATIONS |
| Input
Terminals |
|
1.5 mm male SAFELEAD |
| Input
Signal Voltage |
|
±5
volts maximum |
|
Input Impedance |
|
1
x 1012 Ohms, 10 pF capacitance
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| Noise |
|
15
microvolts peak to peak, referred to input (complete Model
15 system), 100 Hz Low Pass Filter setting |
| CMR |
|
>5000:1
(complete Model 15 system) |
| Gain |
|
Unity,
between 0.995 and 1.0 |
| Power |
|
Via
Model 15 Isolated Power Terminal, 17-foot (5.1 m) cable
provided |
| Physical
Size |
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3.375"
W x 1.25" H x 7.125" L
(8.6 cm x 3.2 cm x 18.1 cm) |
| Weight |
|
0.6
lbs. (0.027 kg) |
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| ORDERING
INFORMATION |
| Model
15BIHIP |
|
High
Impedance Probe, multichannel |
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