Tektronix WFM6120 Technical Reference

Specifications
Table 33: LTC Time Code Input / Ground Closures (cont.)
Characteristic Performance requirement Reference information
Ground Closure Input Signaling
(Preset Selection)
TTL thresholds, 5 V maximum input,
–0.5 V minimum input. Pull low to assert
Has internal 10 kΩ pull-upto5Voneach
input
Direct or encoded inputs must be asserted
and stable for at least 150 ms to be
recognized reliably. Inputs that are stable for
75 ms or less will never be recognized
Inputs are sampled every 16.6 ms. Five
consecutive samples must all have the same
code for the code to be accepted. It is
possible to pulse the codes synchronously
with the sampling process and trick the
system. Users are encouraged to work
within the intent of the specification to insure
reliable operation
Ground Closure Output
Characteristics
One open collector output
Pulledupby10kΩ resistor in series with a
diode to +5 V. Pull down c urrent is limited
by 10 Ω resistor. Maximum current allowed
is 100 mA
Table 34: VITC Decoding
Characteristic Performance requirement Reference information
Sources Composite input A or B, SDI input A or B
No em
bedded time-code extraction
Table 35: Serial Digital Video Interface (Input A, Input B)
Characteristic Performance requirement Reference information
Video Inputs Two inputs; only one input active at a time
Format
HD: compatible with SMPTE
292M/BTA -S004A
SD: compatible with 270 Mb/s SMPTE 259M
3 Gb/s: compatible with SMPTE 424/M and
SMPTE 425M
Input Type
75 Ω BNC, internally terminated
30 Waveform Monitors Specifications and Performance Verification

Tektronix WFM6120 Specifications

General

Brand	Tektronix
Model	WFM6120
Category	Monitor
Language	English