GRAS 26CA-HT 1/2'' CCP High Temperature Preamplifier with BNC Connector

Freq range: 2.5 Hz - 200 kHz
Noise: 1.8 µV Gain: -0.30 dB
Special feature: High Temperature

Technology

Typical applications and use

Prepolarized microphones 

Operating temperature up to 120 °C (248 °F)

Low noise floor and wide frequency range

Design

The GRAS 1/2" Preamplifier 26CA-HT is similar to the GRAS 26CA Standard Preamplifier, but optimzed for use in high-temperature applications up to 120 °C (248 °F).

It uses a CCP (Constant Current Power) supply, e.g. GRAS 12AL 1-Channel CCP Power Module with A-weighting filter. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz. Its small ceramic thick-film substrate has a very high input impedance, and is shielded by a guard ring to minimise the influence of stray capacitance and microphonic interference.

It has TEDS* according to IEEE P1451.4 for easy self identification and reading of calibration data.

It has an integrated BNC output connector and can be used with all GRAS prepolarized microphones. The casing is made of stainless steel for maximum strength and durability.

* Transducer Electronic Data Sheet

Specifications

Frequency range (±0.2 dB) with 18 pF microphone dummy
Hz
2.5 to 200 k
Slew rate
V/µs
20
Input impedance
GΩ // pF
20 // 0.4
Output impedance
Ω
< 50
Output Voltage Swing, min. @ 24-28 V CCP voltage supply
Vp
8
Noise (A-Weighted) max.
µV
2.5
Noise (A-Weighted) typ.
µV
1.8
Noise (Linear 20 Hz – 20 kHz) max.
µV
6
Noise (Linear 20 Hz – 20 kHz) typ.
µV
3.5
Gain
dB
-0.30
Power supply (Constant Current Power)
mA
2 to 20 (typical 4)
DC bias voltage, typ.
V
12
Temperature range, operation
°C / °F
-30 to 120 / -22 to 248
Temperature range, storage
°C / °F
-40 to 85 / -40 to 185
Humidity range non condensing
% RH
0 - 95
TEDS UTID (IEEE 1451.4)
769 v. 0.9
Connector type
BNC
CE/RoHS compliant/WEEE registered
Yes / Yes / Yes
Weight
g / oz
26.0 / 0.92
Specification Conditions

Conditions: 23 °C Ambient temperature, 4 mA / 24 V open loop CCP voltage, 18 pF dummy microphone, 3 m output coax-cable.

The TEDS is guaranteed to work properly up to 85 °C. We have no indication that it will not work properly up to 120 °C, however we cannot guarantee that it will remain stable at this level.

 

Noise vs. temperature, linear 20 Hz - 20 kHz

 

Typical noise level at 25, 50, 75, 100 and 120 °C, 1/3 octave bands.

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Dimensions

Ordering info

Optional items

GRAS AA0018

3 m BNC - Microdot Cable, High Temperature

GRAS AA0095-CL

Customized Length BNC - BNC Cable, High Temperature

GRAS AE0046

BNC male - Microdot female Adapter

GRAS AL0012

1/2" Microphone Holder, Stainless Steel

GRAS RA0019

Adapter for 1/4" microphone and 1/2" preamplifier

GRAS RA0073

Adapter for 1" microphone and 1/2" preamplifier

GRAS RA0190

Right-angled (90º) Adapter for 1/2" Microphone and 1/2" Preamplifier

GRAS 12AL

1-Channel CCP Power Module with A-weighting filter

GRAS 12AQ

2-Channel Universal Power Module with signal conditioning and PC interface

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

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