Velleman DVM20FGCN2 - Manual (Page 5)

DVM20FGCN2
19.04.2011 ©Velleman nv 5
5. External Voltage control output frequency
a) Press down the square wave button [6], select a proper range [5] and set the desired frequency [8].
b) Attach an external control voltage (0 to +10V regardless of polarity) to the VCF input jack [14]; the
signal is available from terminal OUTPUT [15]. The user can now control the output frequency by
adjusting the external DC voltage.
6. External Frequency Counter
a) Set the EXT/INT selector [19] on the rear panel to EXT mode and connect the external signal to the Ext
counter input jack [21].
b) When the input signal is too strong, use the attenuation button [20] to attenuate the signal by 20dB.
7. Technical specifications
Frequency Range 0.1Hz~2MHz in 7 steps
Waveform
sine, square, triangle, positive & negative pulse, positive & negative
ramp
Rise and Fall Time (square waveform) < 100ns
Sine Waveform
Distortion < 1% between 10Hz~100KHz
Frequency Response
< ± 0.5dB between 0.1Hz~100KHz, < ± 1dB between
100Hz~2MHz
TTL/CMOS Output
TTL Low Level < 0.4V
TTL High Level > 3.5V
CMOS Low Level < 0.5V
CMOS High Level 5V to 14V, continuously adjustable
Rise Time < 100ns
Output
Impedance 50Ω ± 10%
Amplitude > 20Vp-p (no load)
Attenuation 0dB, 30dB
DC Offset from 0 to + 10V, adjustable continually
Symmetry Adjustment Range 90 : 10 ~ 10 : 90
VCF Input
Input Voltage -5V to 0V ± 10%
Max. VCF Ratio 1000 : 1
Input Signal DC ~ 1KHz
Frequency Counter
Measuring Range 1Hz ~ 10MHz
Input Impedance ≥ 1MΩ / 20pF
Sensitivity 100mVrms
Max. Input
150V (AC + DC) (with attenuator)
Input Attenuation 20dB
Measurement Error ≤ 3 x 10 -5 ± 1 word
Power Source 230Vac/115Vac ±10%, 50-60Hz ±2Hz
Ambient temperature 0 – 40°C
Humidity max. RH90%
Atmospheric Pressure 86kPa ~ 104kPa
Size (L x B x H) 262 x 85 x 260mm
Weight 1.8kg
Use this device with original accessories only. Velleman nv cannot be held responsible in the event of
damage or injury resulted from (incorrect) use of this device. For more info concerning this product
and the latest version of this user manual, please visit our website www.velleman.eu. The
information in this manual is subject to change without prior notice.