G.R.A.S. 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

Typical applications and use

Prepolarized microphones 

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

Low noise floor and wide frequency range

Design

The G.R.A.S. 1/2" Preamplifier 26CA-HT is similar to the G.R.A.S. 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. G.R.A.S. 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 G.R.A.S. prepolarized microphones. The casing is made of stainless steel for maximum strength and durability.

* Transducer Electronic Data Sheet

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

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.

G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.

Optional items

G.R.A.S. AA0018

3 m BNC - Microdot Cable, High Temperature

G.R.A.S. AA0095-CL

Customized Length BNC - BNC Cable, High Temperature

G.R.A.S. AE0046

BNC male - Microdot female Adapter

G.R.A.S. AL0012

1/2" Microphone Holder, Stainless Steel

G.R.A.S. RA0019

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

G.R.A.S. RA0073

Adapter for 1" microphone and 1/2" preamplifier

G.R.A.S. RA0190

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

G.R.A.S. 12AL

1-Channel CCP Power Module with A-weighting filter

G.R.A.S. 12AQ

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

G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.