BRUEL & KJAER 2732 - Frequency Response and Distortion

CHAPTER 4
Characteristics
13
As shown in Fig.4.2, the maximum output current is frequency dependent. The maximum pow-
er output is 120 VA, which can be obtained using exciters with a nominal load impedance of
4 Ω.
Frequency Response
The full power output of 120 VA is available in the frequency range from 40 Hz to 15 kHz. At
lower power levels, the amplifier has a useful frequency range from DC to 150 kHz. This
depends on the signal input socket used and the setting of the V/C Mode switch, as shown by
the response curves for small signals given in Fig.4.3.
Fig.4.3 Frequency response in Voltage Mode of Type 2732 for small power output levels
Distortion
The percentage of harmonic distortion produced by Type 2732 is shown in Fig.4.4. Considering
the 120 VA power output rating of the amplifier, the amount of distortion is very low. This can
be attributed to the generous amount of feedback applied and the use of a direct-coupled input.
Low Impedance DC Input Specification LIMIT
Low Impedance AC Input Specification LIMIT
DC Input
AC Input
Low Impedance
Voltage
2
51020
50 100
200 500
1k 2k 5k
10k 20k 50k
100k
010217
Frequency (Hz)
-10
-9
-3
-2
-1
0
1
2
3
4
5
Relative Amplitude (dB)
-4
-5
-6
-7
-8
1
200k
500k
1M