JAI CV-A1 operation manual PWC H synchronous accumulation PWC asynchronous accumulation

CV-A1

Binning mode BI is a function where the signal charge from 2 or more adjacent pixels are added together and read out as one pixel. A resulting full frame with lower resolution can be read out with a higher rate. By adding 2 pixels together, the sensitivity is doubled. The CV-A1 has both vertical and horizontal binning. With V binning the pixel charge from 2 adjacent lines are added together in the horizontal ccd register. It is done by double pulses to the vertical ccd register. With H binning the pixel charge from 2 horizontal adjacent pixels are added together in the sample/hold circuit after the horizontal ccd register. It is done by shifting the charge from 2 horizontal ccd cells into the sample/hold capacitor for each reset pulse.

Both vertical and horizontal binning can work together. The sensitivity is then 4 times normal. The aspect ratio will be correct, if the sampling frequency is divided with 2. See fig. 10.

H Xsg1

Displayed image with binning

1380 pixels 690 pixels

No V binning	register
	Verticalccd
V binning	Video out

Horizontal ccd register

S/H Reset

No H binning	f pix		Pclk out
	S/H	Reset
		:2	Pclk out
H binning	f pix

pixels1035

Normal full scanning. Aspect ratio correct 1380 pixels

pixels501

Vertical binning

1035 pixels

Horizontal binning

690 pixels

501 pixels

V and H binning.

Aspect ratio correct

H binning is 2:1. V is 2:1. Together it is a 4 :1 binning

Fig. 10. Binning.

The accumulation mode HC can be set to asynchronous accumulation (HC=1). The exposure in PWC mode (TR =2) and Frame Delay readout (TR=3) will start immediately at the leading edge of the trigger pulse without waiting for the HD. Fig. 11 and fig. 12 shows the details.

HD	HD
Trigger	Trigger
Accum	Accum
X b	X b
Fig. 11. PWC H synchronous accumulation	Fig 12. PWC asynchronous accumulation

In normal trigger mode (TR=0) shutter speed up to 1/200,000 sec. can be used. In all triggered shutter modes, the shortest shutter time is limited to ≥1,3 H. (1/12,000). In triggered shutter modes with partial scan or binning, the longest shutter speed is not limited by the frame read out time. It can be longer.

Trigger modes with possible scanning and binning combinations

TR=	Scanning	Full scanning				Partial scanning					Remarks
	Binning	norm.	V	H	V+H	Norm	V	H	V+H
0	Normal	√	√	√	√	√	n	n	n	SM=0, SM=1 active
1	Edge Pre-sel.	√	√	√	√	√	n	n	n	SM=0, SM=1 active
2	Pulse Width	√	√	√	√	√	n	n	n	HC=0, HC=1 active
3	Fr. Delay r.o.	√	√	√	√	√	n	n	n	HC=0, HC=1 active
4	Long Time int	√	n	n	n	n
5	Start/Stop	√
6	Smearless	√	√	√	√	√	n	n	n	SM=0, SM=1 active

√Described mode

n Non-described mode combination, which will work

- 7 -