GRAS 26CF 1/2'' CCP Preamplifier with BNC Connector, Gain and Filters
Freq range: 2.5 Hz - 200 kHz
Noise: 1.8 µV Gain: -0.25 / +20 dB
Special feature: 0/20 dB gain, A-weighting and HP filters
The GRAS 1/2-inch Preamplifier GRAS 26CF is a general purpose preamplifier optimized for use with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply, e.g. GRAS 12AL. It has low inherent noise level, a large dynamic range and a frequency response from 2.5 Hz to 100 kHz.
Technology
Gain and filter switch settings
There are two flush-mounted switches for selecting various combinations of gain and filtering, i.e.:
Gain switch settings:
- 0 dB - for normal microphone signals.
- +20 dB - for boosting weak microphone signals.
Filter switch settings:
- A-Weighting - as required in standard measurements.Linear - to let the microphone signal passunfiltered.
- High-pass - to cut off unwanted low frequencies.
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.
The GRAS 26CF can be used with all GRAS prepolarized microphones, namely:
- 1/2-inch microphones: GRAS 40AE, 40AD and 40AQ
- 1/4-inch microphones: GRAS 40BE and 40BD, using the optional 1/2-inch to 1/4-inch adaptor RA0019
It has an integrated BNC output connector.
The casing is made of stainless steel for maximumstrength and durability.
CCP stands for “Constant Current Power” and describesGRAS power supplies that maintain a constant level ofcurrent for driving IEPE transducers like this preamplifier which can be used with prepolarized microphone cartridges such as GRAS 40AD, 40AE, 40AO and 40AQ.
Specifications
Conditions: 23 °C Ambient temperature, 4 mA / 24 V open loop CCP voltage, 18 pF dummy microphone & 3 m coax-cable.
Frequency response of A-weighting filter (compliant with IEC 61672-1 Class 1)
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
Dimensions
Ordering info
Optional items
| GRAS AA0035 | 3 m BNC - BNC Cable |
1/2" Microphone Holder, POM | |
| GRAS AL0012 | 1/2" Microphone Holder, Stainless Steel |
Swivel head | |
Tripod | |
| GRAS RA0019 | Adapter for 1/4" microphone and 1/2" preamplifier |
| GRAS RA0073 | Adapter for 1" microphone and 1/2" preamplifier |
Right-angled (90º) Adapter for 1/2" Microphone and 1/2" Preamplifier | |
20 dB Attenuator for prepolarized 1/2" microphones | |
20 pF Preamplifier-input Adapter for 1/2" preamplifiers | |
1-Channel CCP Power Module with A-weighting filter | |
2-Channel Universal Power Module with signal conditioning and PC interface |
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
